fordrsrickc

iTrader: (5)

When i start my car in the morning from cold and drive off it has no acceleration and very hesitant not that i ever drive away quick obviously as i warm the turbo up first,...but it has a lack of power even as a general car until it is warm and then it is fine after about 5 mins is this normal as i am new to subarus and is it an engine fail safe or something? my car is a sti 2003 cheers Rick

555gc8

I have the exact same problem the car doesn't want to accelerate untill it is warmed up fully and then it runs great. I have to be cautious at junctions when the car is cold. Does anyone know if this is a sensor fault?

barnshaw

iTrader: (1)

could be coolant temp sensor or similar? might be worth getting any fault codes read first

scoobynewbie72

iTrader: (1)

could be mapped to do this to protect the engine.

steeveebee

Have you tried your Neutral Position Switch. I don't profess to know lots about tuning but I have a v7 wrx that felt like it ran on 3 & 1/2 cylinders (mainly around 2800 revs) and my engine light kept coming on and off usually after a couple of days each as well as flashing at said revs whilst cold.After many times back and forth to my mapper (who couldn't source the problem either) , found out that it was my NPS which cost me about £40 plus delivery. Apparantly it doesn't get picked up when plugging in the fault code finder(don't ask me why) so I just bought one as a process of elimination and the light hasn't come back on since......and the car drives fine also

scoobynewbie72

iTrader: (1)

if u have a lead and romraider you can go into the ECU switches section that tells it when to log, there is a NPS setting, if you tick that and move the gear stick it will tell you if its getting a signal or showing you that the NPS is working.
hth